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SLIDE TEXT 
ST 19-21 



CONSUMER PRODUCTS 



19 and 21 



ROTARY MOWERS 




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SECTION 10 
GENERAL 1 



19 & 21 ROTARY MOWERS 



INTRODUCTION 



The John Deere 19 and 21 Rotary Mowers 
have many quality features to bring you 
new mowing efficiency and convenience, 
as well as greater ease of operation 
and maintenance. 

The 19 Rotary Mower has a 19-inch cut 
and is hand-propelled. It is available 
with either manual recoil or key-electric 
start. 

The 21 Rotary Mower has a 21-inch cut. 
It is available as a hand- or self-pro- 
pelled model with either manual recoil 
or key-electric start. 



19 & 21 GEN 1 




********************* 



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PREDELIVERY : 

Remove mower and parts from carton. 

Attach lower handle to deck studs and 
secure with spring locking pins. 

NOTE: Be &uAe. hole, -in uppe/i portion o£ 
handtz aj> on Kight hand i>i.dz ofa movo&i. 



19 & 21 GEN 2 




********************* 



On the 19" Mowers attach the upper handle 
with curved head bolts and locking nuts. 
Be sure nuts are installed on inside of 
handle. 



19 & 21 GEN 3 




SECTION 10 
GENERAL 2 



On the 21 Mower attach the upper handle 
with curved head bolts and T-shaped 
handle. Be sure bolt heads are toward 
center of handle. 



19 & 21 GEN 4 




********************* 



Raise handle to a comfortable height 
and lock in one of three positions on 
the handle adjusting lever. 



19 & 21 GEN 2 




********************* 



19 & 21 GEN 5 



Attach the control panel to upper handle 
with 4 self-tapping screws. 

For initial charge and battery service, 
remove the battery as shown. 

The battery should be charged for 48 
hours before use to restore original 
charge . 



********************* 

Attach the control cables to upper handle. 19 & 21 GEN — 6_ 




SECTION 10 
GENERAL 3 



To attach the grass bag attachment re- 
move wing nut and lift the hinged chute 
deflector. 

Place bag chute in position and replace 
wing nut. 

Place open end of bag over chute and 
pull cord until bag fits snugly on 
chute. 

Place cord through metal cord fastener. 

Install bag hanger on handle and attach 
upper end of bag over hanger. 

When the bag is not to be used lower 
the hinged chute deflector over the 
stud. Tighten the wing nut securely. 



19 & 21 GEN 7 




********************* 



To adjust height, grasp lever and wheel 
and squeeze together. Move both until 
the lever stud is at the desired posi- 
tion. Release lever and wheel will lock 
in place. 

Five cutting positions are available on 
the front and rear wheels , ranging from 
1-3 inches . 

A 1/2- inch setting is also available on 
the front wheels only for special cut- 
ting practices, such as clean-up opera- 
tions or when cutting St. Augustine or 
Bermuda grasses. Whenever the 1/2- inch 
front wheel setting is used, position 
rear wheels in 1-inch setting. 




********************* 



BEFORE STARTING THE ENGINE: 

Walk-behind mowers will be shipped with- 



19 & 21 GEN 9 



*S 



SECTION 10 
GENERAL 4 



Never remove the dipstick with the 
engine running. 

Use regular grade gasoline only. Do not 
mix special additives to the gas. 

On self-propelled mowers, always place 
front wheel drive clutch lever in the 
disengaged position before starting the 
engine. 

Refer to Operator's Manual for other 
operational and safety information. 



********************* 






ENGINE SPECIFICATIONS: 



SECTION 20 
ENGINE 1 



19 Mower 

Manufacturer Tecumseh 

Model LAV 30 

Cylinder Single, C.I. sleeve 

Bore and Stroke 2.31 x 1.84 in. 

Displacement 7.75 cu. in. 

Type 4-cycle, vertical crankshaft 

Speeds (fast) 2300-3600 rpm 

Speeds (idle) 1800-2300 rpm 

Horsepower 3 HP @ 3600 rpm 

Valve Clearance (intake) cold.. 0.010 in. 
Valve Clearance(exhaust)cold. .0.010 in. 
Compression Release. Internal Mech. type 

Crankcase Capacity 21 ounces 

Type of Crankcase 

Lubricant AM 30730 

Starter(electric optional) . .Rope recoil 

The mower is equipped with a service- 
able polyurethane air cleaner element. 

Clean the element every 10 hours of 
operation or more often when cutting in 
extremely dusty conditions. 

To clean the element, grasp the tab and 
lift the air cleaner cover upward. Re- 
move the polyurethane element. Wash 
the element in a water and detergent 
solution, squeezing it like a sponge. 
Squeeze and shake dry. 

The element must be thoroughly dry 
before oil is added. Use paper towels 
to remove moisture. 

Pour (5) teaspoons of the same oil used 
in the engine crankcase on the sides 
and open end of the element in case and 
install air cleaner cover. 



21 Mower 



Tecumseh 

LAV 35 

Single, C.I. sleeve 

2.50 x 1.81 in. 

8 . 9 cu . in . 

4-cycle, vertical crankshaft 

2300-3600 rpm 

1800-2300 rpm 

3% HP § 3600 rpm 

0.010 in. 

0.010 in. 

... Internal Mechanical type 

21 ounces 



AM 30730 

(electrical optional) Rope recoil 



19 & 21 ENG 1 



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********************* 



The serial number plate for the engine 
contains several groups of numbers . 
The serial number of the engine is the 
number which immediately follows the 
word "Serial" on the serial plate. This 
number is valuable to the factory and 
should appear on warranty claims and 
correspondence referring to engine 
problems . 

The plate is located at the front of 
the engine just below the engine shroud. 



SECTION 10 
ENGINE 2 



19 & 21 ENG 2 







********************* 



ENGINE REMOVAL: 

Remove air cleaner cover, oil and gas 
gauge. 

Lift starter handle several inches with 
one hand. Insert other hand under eng- 
ine shroud, and place rope in V-strap 
on starter. Remove starter handle. 

Remove (4) metal screws and lift off 
engine shroud. 



19 & 21 ENG 3 




********************* 



Loosen clamp on control cable and dis- 
connect inner wire from carburetor. 

Remove belt guard over drive belt. 
Loosen set screw and remove belt from 
gear drive sheave. 



19 & 21 ENG 4 







********************* 



SECTION 20 
ENGINE 3 



NOTE: V-UaonntcX Apcuik plug volte., dfialn 
gcu> faom tank and catbuJietot and AeX 
movoex on Itit hand Aide.. 

Remove blade nut, plain washer, anti- 
scalp disk and blade. Remove belt from 
engine sheave. 

Remove two bolts and lift muffler out. 

Carefully remove the four bolts which 
attach the engine to the deck and lift 
the engine out. 

CAUTION: Do not allow engine to fall as 
these bolts are removed. 



19 & 21 ENG 5 




********************* 



Refer to SM2091 for complete engine in- 
ternal service. 

Reverse the removal procedure for install- 
ation. 




********************* 



RECOIL STARTER DISASSEMBLY: 

Remove air cleaner cover, oil gauge and 
gas gauge. 

Lift starter handle several inches with 
one hand. Insert other hand under eng- 
ine shroud and place rope in V-strap on 
starter. Remove starter handle. 

Remove (4) metal screws and lift off 
engine shroud. 



19 & 21 ENG 3 




SECTION 20 
ENGINE 4 



Remove (3) screws and lift starter from 
engine. 



19 & 21 ENG 7 




********************* 






Remove rope from V-strap and allow 
spring to unwind slowly, using your 
thumb as a brake. 

Remove (2) screws from metal cover over 
spring assembly. 



19 & 21 ENG 8 




Turn out bolt and lift out spring re- 
tainer. Lift spool and sprocket from 
bracket stud. 



19 & 21 ENG 9 



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SECTION 20 
ENGINE 5 



Remove cupped washer and turn sprocket 
off spool. 

Pull rope from spool if replacement is 
necessary. 

Lift recoil spring from spool if replace- 
ment is necessary. 



19 & 21 ENG 10 







********************* 






ASSEMBLY OF RECOIL STARTER: 

Insert rope through hole in spool. Tie 
knot in rope end and insert knot in re- 
cess of spool. 

Install spring with loop positioned over 
post on spool. 



19 & 21 ENG 11 




********************* 



Replace sprocket with retaining clip. 
Assemble cupped washer. 



19 & 21 ENG 12 




Install sprocket and spool assembly over 
post on bracket. 

NOTE: Be 4uAe si&tcu.ning ctip aj> ovzft 
exte.nde.d tip on bfuzckoA.. 



19 & 21 ENG 13 



SECTION 20 
ENGINE 6 




********************* 



Position spring retainer so inner end of 
spring is locked in notch of retainer. 
Tighten bolt securely. 



19 & 21 ENG 14 

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Replace metal spring cover using (2) 
metal screws . 

CAUTION: Do not overtighten these 
bolts. 

Hold starter bracket firmly in left 
hand. Starting from position of rope 
spring, wind spring (5) complete turns 
in direction of arrow. 

Hold sprocket firmly so spring can not 
unwind and thread rope into position 
on spool. 



********************* 

19 & 21 ENG 15 










SECTION 30 
FUEL SYSTEM 1 









ADJUSTING CARBURETOR: 

Idle adjustment and high speed adjust- 
ment must be made at the same time as 
each affects the other. Adjust as 
follows : 

1. Turn high speed mixture needle 
(A) and idle mixture needle (B) 
clockwise until closed. Close 
finger tight only. Then open 
one turn (counterclockwise) . 

2. Start engine and raise throttle 
lever to "fast" position. Allow 
engine to warmup . 

3. Turn high speed mixture needle 
(A) 1/8 turn each time, clockwise 
and counterclockwise until engine 
runs smoothly at full throttle. 
Keep needle position slightly on 
the rich side (open) . 

4. Move throttle lever to "slow" 
position and turn idle mixture 
needle (B) 1/8 turn each time, 
clockwise or counterclockwise 
until engine idles smoothly. 

5. Advance throttle lever quickly to 
check for uniform acceleration. 
If engine misses, gas-air mixture 
is too lean. Turn high speed mix- 
ture needle counterclockwise un- 
til positive acceleration can be 
obtained. 



19 & 21 FS I 




If excess exhaust smoke is noticed, mix- 
ture is too rich. Readjust idle mixture 
needle if necessary, until good balance 
is achieved and engine idles smoothly 
between 1800-2300 rpm. The idle stop 
screw (C) adjusts the speed at which 
the engine idles . This is factory- 



SECTION 40 

ELECTRICAL SYSTEM 1 



SPECIFICATIONS: 

Ignition High Tension Flywheel Magneto 

Spark Plug Gap 030 

Breaker Point Gap 020 






IGNITION SYSTEM 

Flywheel holes require tapping or using 
self-tapping screws. The puller shown 
(Tecumseh Part No. 670215) is equipped 
with self-tapping screws. Use strap 
wrench to hold flywheel while removing 
flywheel nut. 

A knockoff tool is also available for 
removing the flywheel (Tecumseh Part 
No. 670103). 



19 & 21 ELECT 1 







********************* 



Now turn the crankshaft until the lobe 
causes the points to open at the widest 
point. Check the points to see if they 
are pitted or burned. The proper gap 
is .020. 

It is always a good policy to replace 
the condenser when the points are re- 
placed. A faulty condenser can ruin 
the points. 

Even though it was necessary to remove 
the top three head bolts to gain access 
to these electrical components, it is 
not necessary to replace the head gasket, 



RM ELECT 13 




********************* 



SECTION 40 

ELECTRICAL SYSTEM 2 



If the ignition points appear to be 
good, then we should check the ignition 
coil. Remove the coil by prying off 
the wire retainer and disconnecting the 
leads . 



RM ELECT 14 




********************* 









There are five tests for an ignition 
coil: 

1. Coil power test. 

2. Coil high speed test. 

3. Coil surface insulation test. 

4. Continuity test. 

5. Coil ground test. 

Make all of these tests according to 
the instructions and specifications, 
which came with your tester. If no 
tester is available, install a new coil 
and check to see if this will correct 
the spark problem. 



70 ELECT 19 




********************* 






When replacing points or ignition coil 
do not remove or loosen the core and 
plate assembly as this will throw the 
engine out of time. 



70 ELECT 20 




SECTION 40 

ELECTRICAL SYSTEM 3 



ENGINE TIMING: 

When short blocking the engine or for 
any other service work which requires 
removal and replacement of the coil 
mounting core and plate assembly, it 
will be necessary to time the engine 
as follows: 

1. Remove the engine shrouding. 

2. Remove cylinder head and gasket. 

3. Turn the crankshaft until the 
high point of the ignition cam 
causes the points to open. Set 
the point gap .020. 

4. Turn crankshaft until the piston 
reaches top-dead-center. Then 
turn the crankshaft counterclock- 
wise until the piston moves down 
.050/. 060 below top of cylinder 
block surface. 

5. Loosen the two screws that hold 
core and plate assembly to the 
cylinder. Remove the leads from 
the point terminal when using ohm 
meter or flashlight tester as 
shown. 

Connect one tester lead to the 
point terminal and the other lead 
to a ground. 

Position the core and plate assem- 
bly so that ignition cam on crank- 
shaft just begins to open breaker 
points. This breaks the continuity 
and will be shown on the tester. 
Tighten core and plate assembly 
mounting screw to retain adjust- 
ment. 

6. Reassemble engine. Be sure to 
install new cylinder head gasket 
when reassembling. Tighten head 
bolts to 140-200 in. lbs. 







**************** 



SECTION 40 

ELECTRICAL SYSTEM 4 






OPTIONAL ELECTRIC START TESTING: 

Optional on the rotary mowers is a 12- 
volt starting system. The system con- 
sists of a 10 cell 1.2 amp/hour rated 
nickel cadmium battery pack, switch, 
wire harness, perminent magnet motor 
and charger . 

A simple visual check of a unit before 
tear down will quite frequently allevi- 
ate any need for further tear down. Vis- 
ual inspection for broken, frayed, corro- 
ded, or loose connections should be made. 

BATTERY CHARGER: 

Plug the battery charger into AC outlet 
(110-120 AC outlet). 



19 & 21 ELECT 3 




Using a voltmeter, read DC voltage across 
the charger leads. A good charger will 
read 8.8 to 9.4 volts. If above or 
below, the charger is defective. 

**************** 



* * * * * 



BATTERY : 

Charge the battery for 48 hours before 
making test. The battery should read at 
least 12 DC volts across the battery 
terminals. 

If no voltage (0) is shown on the meter, 
open the battery pack and check for a 
loose connection. 



19 & 21 ELECT 4 




********************* 



The battery should be checked under load 
to determine its dependability. 

Remove the spark plug wire and connect 
the fully charged battery to the mower 
wiring harness. Leave the connectors 
apart a small space so the tester may 



19 & 21 ELEC 5 



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SECTION 50 
POWER TRAIN 1 



GEAR DRIVE BELT REPLACEMENT: 

Remove spark plug wire. 

Remove belt guard over drive belt. 

Loosen tension set screw and lift belt 
over gear drive sheave. 

Position mower slightly on its side. 
Reach under the deck and remove the 
belt from the engine sheave. 

Pull the belt downward and over the 
mower blade. 

Reverse this procedure for replacing 
belt. 



19 & 21 PT 1 




********************* 



Gear drive adjustment is required when 
front wheels fail to turn when the 
drive clutch is engaged. 

Remove belt guard over drive belt. 

NOTE: Viive. belt tension i6 cohxzct 
uiken a. fainm hqu.ee.ze. (10 pound* pie&huAe 
i£ mea&uAed with, a 6 cote) on the. out- 
bi.de o& the belt* neAuXt in a dLexoiance 
o{ not leM, than 1-inch between the 
innex belt bideA. 

To adjust belt tension, loosen the jam 
nut and turn the jack screw as required. 

Loosen cable locking screw. Pull drive 
clutch lever to the rear as far as 
possible. Push cable and inner wire 
as far to the rear as possible to dis- 
engage the clutch. 

Tighten cable locking screw and replace 
belt guard. 



19 & 21 PT 2 





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Position mower so front wheels are off 
the ground slightly. 

Pry off hub cap from each front wheel. 

Loosen wheel bolt and remove each front 
wheel . 



SECTION 50 
POWER TRAIN 2 



19 & 21 PT 3 




********************* 






Remove nut and turn gear, off each end 
of axle. A special tool JDST8 will be 
available from Service Tools Incorpora- 
ted, 1901 Indiana Avenue, Chicago, 
Illinois 60616 for removing the gear on 
the end of the axle. 

Lift off dust cap, cutting height lever 
and bushing. 

Lift axle and gear box out. 

Reverse this procedure for reassembly. 
Be careful not to overtighten gear on 
the end of the shafts. 



19 & 21 PT 4 




********************* 



GEAR DRIVE DISASSEMBLY: 

Remove drive sheave and locking sleeve. 

Turn out bolt and remove clutch lever, 
dust cap and wear plate. 



19 & 21 PT 5 




SECTION 50 
POWER TRAIN 3 



Remove (4) bolts and lift cover from case. 

Pull worm shaft from bearing. 

Remove V-shaped clutch engagement clip. 



19 & 21 PT 6 




Pull roll pin. 



********************* 

19 & 21 PT 7 



Slide out clutch engagement shaft and 
spring. 

Press out bearing if replacement is 
required. 







Drive roll pin down approximately 1/2- 
inch. Rotate shaft and pull roll pin 
out with pliers. 

Pull long end of shaft out of gear case 
and lift out drive gear, clutch and 
plain washer. 

Reverse procedure for assembly. 

Fill lower case half 2/3 full with AM 
30200 gear type transmission oil. 



********************* 

19 & 21 PT 




********************* 



SECTION 70 
MISCELLANEOUS 1 



REMOVE, SHARPEN AND REPLACE BLADE: 

Disconnect spark plug wire, drain gas 
from tank and carburetor, and set mower 
on left hand side. 

Hold blade with one hand to remove 
blade nut. 

Sharpen cutting edges with a file. 
Maintain original level and sharpen 
blade edges leaving a 1/64-inch dull 
tip on the cutting edge. 

NOTE: Remove, an e.qual amount o& mat- 
erial pwm ea.dk e.nd o& the. blade, to 
maintain pfiopeA balance.. 

Replace blade, anti-scalp disk, washer 
and nut as illustrated. Tighten nut 
firmly . 



19 & 21 MISC 1 











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ANTI-SCALP 
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WASHER 






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